Grinding-wheel dresser.



5. E. HOY & R. P. PLACE.

GRINDING WHEEL DRESSER.

APPLICATION FILED JULY 8.1918.

1,287,024. Patented Dec. 10, 1918.

2 SHEETS-SHEET I.

: .Jb/m 5. H0 1 5, 50/0/70 f? P/ace J. E. HoY & R. P. PLACE.

GRINDING WHEEL DRESSER.

APPLICATION FILED JULY 8.1918.

1,287,024. Patented Dec. 10, 1918.

I 2 $HEET$SHEET 2- Ja/m f. Hay Q4 fiO/and PP/ace,

, anon/r21 7 JOHN- E. HOY AND ROLAND P. PLACE,

or DETROIT, MICHIGAN.

GRINDING-WHEEL DRESSER.

To all 'whom it may concern:

Be it known that we, JOHN E. H01: and ROLAND-P. PLACE, citizens of the United States, and residing at Detroit, county of Wayne, and State of Michigan, have invented a new and Improved Grinding-Wheel Dresser, of which the following is a specification.

It is customary to use diamonds in dressing the side-faces of grinding wheels but this practice has proven exceedingly expensive. Such efforts as may have been made to utilize rotating metal cutters for this purpose have been failures, due to the fact that the relative movement between the grinding wheel and the cutter very quickly ground or burned away the teeth of the lat ter. The present invention aims to provide dressing means of the rigid rotating cutter type wherein each portion of the cutter travels at substantially the same speed as that of the corresponding portion of the end face of the wheel upon whlch it may be working, thereby dressing the wheel by an impacting operation and eliminating the grinding away of the teeth at one end of the tool which would otherwise take place.

To this end it consists in a rigid tapering tool having relative movement toward and from the axis of the wheel to be dressed, and rotatable about an axis inclined to the plane of the formed surface by an angle half the included angle of taper of the tool.

Either the tool or the grinding wheel. or

both may be shiftable to secure the relative movement. The angle of taper depends somewhat on the size of wheel to be dressed, for example, for dressing a wheel twenty four inches in diameter the taper of the tool may be approximately one and five eighths inches to the foot.

The invention is also concerned with certain details of the housing support for the tool; also with certain improvements in the means for excluding dirt from the bearing surfaces; also with various other-details of construction, and with certain novel relations of parts shown, described and polnted out in the claims.

In the drawings, Figure l is a plan view showing the invention applied to one type of grinding machine. Fig. 2 1s a new on the line 2-2 of Fig. 1. Fig. 3 1s an enlarged plan view showing the handle detached from the tool housing, and the tool in working relation to the grinding wheel.

Specification of Letters Patent.

Patented Dec. 10, 1918.

Application filed July 8, 1918. Serial'No. 243,866.

Fig. 4 is a and the housing. Fig. 5 is a section. on the line 5-5 of Fig. 4. Fig. 6 is a section on the line 6-6 of F ig. 5. Fig.7 is a. view showing a preferred construction of the spindle together with the cutter hub detached therefrom. Figs. 8 and 9 are sections on the lines 8-8 and 9-9 of Fig. 7.

In the application of the invention shown in Fig. 1, the bed 1 of the machine has longitudinal ways 2 along which the carriage 3 may be reciprocated; and the carriage has in its upper surface longitudinal ways 4 on which be adjustably clamped in positions corresponding to the length of the work. The bed is also provided with a transverse way 8 along which the support 9 for the grinding wheel 10, that may be driven by the pulley 11 is slidable as by means of a screw 12 and nut 13. As this arrangement of parts is well known, it is not deemed necessary to show the construction more in detail. Obviously, the relative movement between the grinding wheel and the work, which is supported on the usual centers 14 and 15. and rotated as by the pulley 16, might be accomplished by shifting the grinding wheel longitudinally of the axis of the work and by shifting the carriage transversely of the bed-in other words, the invention is applicable to substantially all types of grinding machines.

Fixed to the tail stock in any suitable way as by a hand screw 20 and projecting pin 21 is a holder 22 for the dresser tool, the handle 23 of which may be clamped therein by a set screw 2* The construction of the holder is subject to wide variation, and it may be secured to parts of the machine other than the tail stock. The handle has fixed thereto, say by the screw 26 and the interengaging flat surfaces 28-29 and 30-31, a housing 32 that also may varywidely in construction, but which is preferably open at one end and has its other end 33, Fig. 5, perforated to receive the shaft 34 that may be held therein by the set screw 35. Rotatable on the re duced portion 36 of said shaft is a dressing wheel that, in the embodiment shown, includes the tubular hub 38 on which are mounted the toothed disks 39. These disks are clamped firmly together as by pressing end flanges 40 on the hub and are spaced from each other about the axis of the lat er,

tlon showing the relation between the handle preferably in the manner shownand claimed in our co-pending application for Patent S.

stance, however, the cutter tapers from end to end. Cup-shapedhousings 43, which are interposed between the end cutter disks and the flanges 40, have pressed therein rather thick washers 44 of brass or the like and project beyond the same to exclude dust from the seams, and a washer 45 and nut 46, the inclination of the thread of which is such as to cause the cutters to tend to tighten it, retains the tool in place on the spindle. The cutter might be formed of a single block. It is also evident that the handle 23 might be integral with the housing 32.

The groove 50, passages 51-52-53 and grease cup 54 sufiic'e for lubricating purposes.

By properly computing the angle of taper of the tool, and by inclining the axis of the spindle shaft 34 to the axis of the handle 23 an angle half the included angle of taper, the tool willgenerate upon the grinding .wheel an end surface or face 55 which is perpendicular to the axis of said wheel, it being understood that the axis of the handle 23 is perpendicular to the axis of said wheel. The tool is thus in engagement with the wheel from end to end of the former; stating it another way, the approximately conical surface of the tool is in substantially line contact with the wheel throughout the length of the particular longitudinal element of the conical surface which may at a given instant be in engagement with the wheel. It is ordinarily onl necessary to dress a belt a few inches wide around the outer edge of the end face, and it is found in practice that the teeth engage the wheel substantially in rolling contact, that is, although the disks are rigidlyheld from turning angularly in respect to each other, each tooth engaged by the wheel travels at approximately the same speed as that point of the surface with which it is in contact. The maintaining of the teeth in proper angular relation to each other about the axis of the spindle, as distinguished from the use of loose disks is of importance as a smoother surface can thus be formed.

It will be understood that the tools are made up in rights and lefts. WVhen it is desired to dress the opposite end face'of the wheel, the tool shown is removed, the carriage is shifted to the left, Fig. 1, until the wheel stands at the right of the tail center, and a second or left hand tool is inserted in the holder after which the parts are manipulated as before, as willbe ob- VlOllS.

Various changes, other than those indicated heretofore, may be made without departing from the spirit of the invention,

and we do not, therefore, wish to be limited except as indicated by the subjoined claims.

We claim 1. Means for dressing grinding wheels comprising a rotatable tapering metallic cutter inclined to the proposed surface of the wheel half its included angle of taper and with its end of least diameter nearest the center of the wheel, and means for establishing relative movement between the wheel and the cutter toward or from the center of the wheel.

2. In mechanism of the class described, a rigid rotatable conical toothed metallic cutter having a taper of such extent that the several portions thereof are adapted to have substantially rolling contact only with the end surface of a grinding wheel, and means for holding the cutter with its axis inclined to the plane of the desired end surface of the wheel half the included angle of taper of the cutter, and means for establishing relative movement between said wheel and the cutter in a plane perpendicular to the axis of the wheel.

"3. A grinding wheel dresser comprising a rigid rotatable toothed tapering tool, a housing therefor, and a handle supporting the housing and inclined to the axis about which the tool turns by an angle equal to half the included angle of taper of the tool.

4. A grinding wheel dresser comprising a rigid rotatable toothed cutter, a shaft on which the cutter is rotatable, means for supportin the shaftfrom one end only, said cutter lueing tapering and havin its end of least diameter farthest from tie end at which the shaft is supported, and means for holding the cutter against the end of a grinding wheel with its axis inclined to said face so that the cutter engages the wheel from end to end of said cutter, the taper of the cutter being such that substantially rolling contact only is maintained between it and the wheel.

5. In combination a rotatable grinding wheel, a substantially conical rotatable cutting or abrading tool arranged to engage an end face of the wheel substantially by rolling contact only and throughout at least the greater part of the length of the conical surface of the tool, the smaller end of the tool being in contact with the grinding wheel at a point nearer the center of the grinding wheel than the point of contact of the larger end of the wheel.

6. A tool of the class described including a housing, a shaft supported thereby, a taperin cutter rotatable thereon, a handle for tile housing, said handle and housing engaging each other in a plane parallel to the axis of the'cutter, and means for preventing the housing from turning in respect to the handle about a line perpendicular to said plane, the handle being inclined to said plane by an angle substantially the same as that at which the longitudinal elements of the surface of the cutter are inclined to the axis thereof.

7. A tool of the class described including a shaft, a tapering rigid cutter rotatable thereon, means for supporting the shaft, said means including a handle inclined to the axis of the shaft by an angle substantially the same as that at which the longitudinal elements of the surface of the' cutter are inclined to the axis thereof. Y 8. In combination with a tail grinding wheel of a grinding tail stock stock and a grinding machine, a wheel dresser supported by the and projecting therefrom toward presentin the axis of the Wheel,

chine including a grinding wheel, a grinding wheel dresser supported on the machine, said dresser including a rotatable tool a tapering Working surface engaging with the end face of the wheel and driven thereby throughout the length of the tool by substantially rolling contact only.

JOHN E. HOY. ROLAND P. PLACE. 

